/Engine/Plugins/Online/OnlineSubsystem/Source/Public/Interfaces/OnlineMessageInterface.h
virtual void TriggerOnDeleteMessageCompleteDelegates ( int32 LocalUserNum, bool Param1, const [FUniqueMessageId](API\Plugins\OnlineSubsystem\Interfaces\FUniqueMessageId) & Param2, const [FString](API\Runtime\Core\Containers\FString) & Param3 )